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. 2006 Dec 1;103(50):18923–18927. doi: 10.1073/pnas.0609703104

Fig. 1.

Fig. 1.

tRNA-dependent amino acid transformations leading to Sec and cysteine. (Upper) The SelA route is the bacterial pathway (6). The PSTK/SepSecS is the archaeal/eukaryal route. (Lower) The SepRS/Sep-tRNA:Cys-tRNA synthase (SepCysS) pathway operates in methanogens to synthesize cysteine (16).